The white sea fog of San Francisco is so famous, it’s almost iconic. Whoever’s behind its Twitter persona has also given it a rather large puff of humour (as it declares on its bio, ‘All that is sunny does not glitter, not all those in the fog are lost’) as well as a very human, boy-next-door name: Karl. The fog even goes as far as to discuss music playlists with followers and all. Weather rocks on social media.